Cementboard installed over beefed up framing will not sag.
Installing marble tile on ceiling.
How to install granite tile on a shower ceiling.
Mix up the thinset according to the manufactures specifications.
I plan to apply a kerdi decoupling membrane over 1 2 in.
I d like to extend marble wall tiles up to and across the ceiling of a walk in shower.
Using this starting point spread the mortar and use a trowel to notch it.
When installing tile on the ceiling you want to install the tile on the shower walls all the way up to the last row before the ceiling as i ve done in these photos.
If you are lining up your grout lines rather than installing them diagonally you can then draw lines on your ceiling as guides to where your tiles should be.
After putting each marble tile on the mortar place a 1 16 inch tile spacer between it and the next tile.
Notch trowel the ceiling notch trowel the back of the tile and stick it in place.
Place your marble tile on the mortar.
Cement board also is engineered to bond very well with thin set mortar adhesive which you will use to install your marble tile.
To install cement board spread thin set adhesive over the wood subfloor using a 1 4 inch notched trowel.
Place a pair of 1 4 inch spacers on top.
Although many showers only have tile running up the wall until around the 7 foot mark above the shower head some showers continue all the way up.
If you are applying mortar over seams in the floorboard apply mesh tape to the seams to avoid cracking.
Working on the ceiling is hard enough without worrying about whether you re keeping your layout square and parallel.
Lay the cement board sheets into the thin set and fasten them to the subflooring with 1 1 4 inch cement board.
Try using one of the non sag thinsets like laticrete s 255 or mapei s ultralite.
Continue the installation process with the second course of tiles by applying vertical grooved mastic above the first course slightly wider than the tile.